Brake emergency

I used a type 3 Volkswagen front end on my 110" FED and had a brake hose acting as a check valve because of internal failure. I'd roll into the pits and stop then try and push it through the lane and it took about a minute before it would roll easy. Just because they look good doesn't mean squat but... There is only one flex supply on the rear as mentioned so you would have an issue on both sides provided they are adjusted properly and no air in the system.